Numerical simulation of an aircraft style panel excited by a random pressure field

Abstract

This study describes the development of a model that predicts the sound radiation from an aircraft style panel excited by a dynamic pressure field with arbitrary spatial correlation. Eventually, this model will be used to develop distributed feedback control strategies for systems with spatially correlated inputs. For this study, the input pressure field is simulated using an array of point forces on the panel. The excitation at each point is defined in the time domain using the spectral representation method [M. Shinozuka and C.-M. Jan, J. Sound Vibr. 25(1), 111–128 (1972)]. This method generates sample functions that match the spatial and temporal correlation characteristics of the desired pressure field. Three different types of excitations are considered: a turbulent boundary layer excitation, a diffuse field, and a spatially uncorrelated disturbance. This approach could be extended to a variety of other types of spatially correlated stochastic inputs as well. A convergence study is also presented to show how many point forces are required to approximate the spatial characteristics of each type of pressure field. [Work supported by NASA.]